If, on the other hand, the receiving application can process the data packets faster than the sending computer is sending them, the acknowledgment signal will tell the sending computer to increase the number of packets in the next transmission.įor efficient data packet transmission, the transmitter must not be forced to stop sending for an unnecessarily long time.
#Sliding window arq free#
If the application in the receiving computer processes the data packets at a slower rate than the sending computer is sending them, the acknowledgment signal from the receiving computer will tell the sending computer to decrease the number of packets in the window size in the next transmission, or to temporarily stop transmission to free the buffer. The limits on window size vary depending on the rate at which the receiving computer can process the data packets, and on the capacity of its buffer. The number of data packets is called the window size. Sliding window ARQ is usually implemented as selective reject ARQ go-back-n ARQ go-reject ARQ a or b 9. The sliding window technique places varying limits on the number of data packets that are sent before waiting for an acknowledgment signal back from the receiving computer. Sliding window is also known as windowing. The objective of the sliding window technique is to use the sequence numbers to avoid duplicate data and to request missing data. There is no waiting for any time-out to share that frame.In the sliding window technique, each data packet (for most data link layers) and byte (in TCP) includes a unique consecutive sequence number, which is used by the receiving computer to place data in the correct order. The sender sends that frame again immediately, receiving a negative acknowledgement. It sends a negative acknowledgement to the sender. If the receiver obtains a corrupt frame, it does not directly remove it. The size of the sliding window is continually greater than 1. In this protocol, the sender window size is always similar to the size of the receiver window. The Goback-N ARQ protocol operates well if it has fewer errors.
It is a data link layer protocol that facilitates a sliding window method. Selective Repeat ARQ is also referred to as the Selective Repeat Automatic Repeat Request. The design of the Go-Back-N protocol is shown below − What is Sliding Window Protocol Before learning about the sliding window protocol, let us first learn about computer networks, the OSI model, and the data link layer (as the Sliding Window Protocol is related to the data link layer). If the sender does not receive the receiver’s acknowledgement, then all the frames available in the current window will be retransmitted. There are two types of sliding window protocols namely - Go-Back-N ARQ, and Selective Repeat ARQ. In this, if any frame is manipulated or lost, all subsequent frames have to be sent again.įor example, in GO- Back –N, the N is the sender’s window size if it is GO-Back-5, the sender will send frame 1 to 5 before receiving the knowledge of frame 1.Īll the frames are numbers to deal with the most and duplicate frames. It is a data link layer protocol that helps a sliding window method. Go-Back-N Automatic Repeat Query (ARQ) protocol is also referred to as Go-Back-N Automatic Repeat Request.
The objective of the sliding window technique is to use the sequence numbers to avoid duplicate data and to request missing data.įollowing are the two types of Sliding Window Protocol − Go Back-n Protocol In the sliding window technique, each data packet (for most data link layers) and byte (in TCP) includes a unique consecutive sequence number used by the receiving computer to place data in the correct order. A sliding window is a method for controlling sending data packets between two network devices where dependable and sequential delivery of data packets is needed, such as using the Data Link Layer (OSI model) or Transmission Control Protocol (TCP). A sliding window is also known as windowing.
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